Android SQLite database oriented application development
- 1. Android SQLite Dr.T.Abirami Associate Professor Department of IT Kongu Engineering College [email protected]
- 2. SQLite - Introduction open-source relational database i.e. used to perform database operations on android devices such as storing, manipulating or retrieving persistent data from the database. T.ABIRAMI/KEC(Mobile application Development 2
- 3. SQLite - Introduction It is embedded in android by default. no need to perform any database setup or administration task. Data is displayed in the logcat. For displaying data on the ListView OR alert message. SQLiteOpenHelper class provides the functionality to use the SQLite database. T.ABIRAMI/KEC(Mobile application Development 3
- 4. Cursor class Retrieving data from SQLite databases in Android is done using Cursors. The Android SQLite query method returns a Cursor object containing the results of the query. Cursors store query result records in rows and grant many methods to access and iterate through the records.
- 5. Methods moveToFirst() to position the Cursor pointer at the first record moveToNext() function to iterate through the records. isAfterLast() method performs a check to see if the cursor is pointed after the last record. When looping through records break the loop when this becomes false.
- 6. SQLiteDatabase db=openOrCreateDatabase("con.db", MODE_PRIVATE, null); T.ABIRAMI/KEC(Mobile application Development 6 Create a database in SQLite
- 7. T.ABIRAMI/KEC(Mobile application Development 7 Create a Table db.execSQL("create table if not exists tblcon(cname,cmob);");
- 8. T.ABIRAMI/KEC(Mobile application Development 8 Insert a data db.execSQL("insert into tblcon(cname,cmob) " + "values('"+strname+"','"+strmno+"');");
- 9. Reset data name.setText(""); no.setText(""); T.ABIRAMI/KEC(Mobile application 9
- 10. View a one record at time String strname=name.getText().toString(); Cursor cr=db.rawQuery ("select cmob from " +"tblcon where cname='"+strname+"'", null); if(cr!=null) if(cr.moveToNext()) no.setText(cr.getString(cr.getColumnIndex ("cmob")));
- 11. Insert String strname=name.getText().toString(); String strmno=no.getText().toString(); db.execSQL("insert into tblcon(cname,cmob) " + "values('"+strname+"','"+strmno+"');"); name.setText("");no.setText(""); T.ABIRAMI/KEC(Mobile application 11
- 12. View String strname=name.getText().toString(); Cursor cr=db.rawQuery("select cmob from " + "tblcon where cname='"+strname+"'", null); if(cr!=null) if(cr.moveToNext()) no.setText(cr.getString(cr.getColumnIndex("c mob"))); } T.ABIRAMI/KEC(Mobile application 12
- 13. name=(EditText)findViewById(R.id.editText1); no=(EditText)findViewById(R.id.editText2); insert=(Button)findViewById(R.id.button1); t1=(TextView)findViewById(R.id.textView1); t2=(TextView)findViewById(R.id.textView2); view=(Button)findViewById(R.id.button2); db=openOrCreateDatabase("Info.db", MODE_PRIVATE, null); db.execSQL("create table if not exists tblinfo(cname,cmob)"); insert.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { String strname=name.getText().toString(); String strmno=no.getText().toString(); db.execSQL("insert into tblinfo(cname,cmob) " + "values('"+strname+"','"+strmno+"');"); name.setText(""); no.setText(""); } }); view.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { String strname=name.getText().toString(); Cursor cr=db.rawQuery("select cmob from " +"tblinfo where cname='"+strname+"'", null); if(cr!=null) if(cr.moveToNext()) no.setText(cr.getString(cr.getColumnIndex("cmob"))); } }); T.ABIRAMI/KEC(Mobile application 13